However, after the plane reached Greenland, it turned around and started flying back towards Ireland.

The U-turn was spotted by photojournalist and aviation photographer Tom Podolec who tweeted: "DIVERSION. Aer Lingus #EI145. Dublin to Los Angeles. Turned around over Greenland and heading back eastbound."

Aer Lingus has since confirmed the flight is returning to Dublin for "technical reasons".

Hi all. The aircraft is returning to Dublin for technical reasons. We expect a normal landing at 2130 local time